How to check if div is visible to user or not?

2018-06-04 11:59:07

Basically i have a notification in the slide bar which is by default not visible(toggled).When any notification comes , it gets populated in the slidebar and on click of a toggle button slide bar opens from right to left.How can i make sure whether user has viewed a particular notification in slideBar.

something similar to this link i have done.

On click of the toggle on top right the slide bar will open and the notification will be visible .how to know that state ??

如果你使用jQuery，你可以做类似的事情

if($(element).is(':visible')) {
    // Hello
}

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